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Catch Cans Which Style

noone

By noone,
in Engines & Forced Induction

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noone Experienced

noone

Posted
Posted

OKay I know have searched cant find an answer so dont shoot me okay :P

Just wanted to know if theres any real difference between these two styles of catch can (see attached) and which would be a better buy for a R32 GTR mostly street driven at the moment but did my first track day and wanna do more, lots a fun. Only have minor mods but running higher than stock boost (as car has since I brought it) and more mods definitly on the way.

Dont really know where the hell I could fit a cusco style one but willing to try if they work better, Can the other type be fitted in the usual variety of ways or only as 100% plumb back?

Any opinions appreciated.

Any pics of where the hell u managed to shoehorn in a catch can on your GTR 32 also appreciated.

post-33041-1171880360.jpg

post-33041-1171880385.jpg

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WazR32GTSt Grand Master

WazR32GTSt

Posted
Posted

i have one like the second one on my GTSt..

really, a catch can isn't a complex device. its a can-shaped object that air flows into and then out of. if it contains some kind of device to slow the air speed (eg baffles or steel wool) then any oil will precipitate and stay in the can to be collected

i have mine situated in the far right corner where the ABS would be if your unlucky enough to have it

there's heaps of info on the fourms about catch cans.. do a search for "+catch +can +mount" and you'll probably find heaps of info..

cheers,

Warren

noone Experienced

noone

Posted
  • Author
Posted (edited)

Yeh have ABS and I can see that if u didnt there would be tonnes of room there.

Have searched and there is lots of info about how to plumb it in etc so that definitly isnt a problem. Being as I am in Darwin Had planned originally to just run venting to atmosphere, no worrys about legalitys

What I was wondering is whether anyone could comment on if the over the rocker type was as efficient as the normal can type, can it be plumbed open to atmosphere (maybe with a little filter type thingo mounted to firewall or something for track days etc.)

and wether it has baffels as putting steel wool etc. in there is gonna be "fun"

Thanks for the replys though guys :P

Edited by noone
WazR32GTSt Grand Master

WazR32GTSt

Posted
Posted
Yeh have ABS and I can see that if u didnt there would be tonnes of room there.

Have searched and there is lots of info about how to plumb it in etc so that definitly isnt a problem. Being as I am in Darwin Had planned originally to just run venting to atmosphere, no worrys about legalitys

What I was wondering is whether anyone could comment on if the over the rocker type was as efficient as the normal can type, can it be plumbed open to atmosphere (maybe with a little filter type thingo mounted to firewall or something for track days etc.)

and wether it has baffels as putting steel wool etc. in there is gonna be "fun"

Thanks for the replys though guys :sick:

in my opinion its best to get a can that can be opened

this makes it easy to check that the baffles are actually good or to putsteel wool in if you want to do that.

i personally got one from justjap.com and it has the ability to open from the top or bottom, it has a drain hole, and seals air-tight. i prepared a baffle consisting of supermarket stockings filled with kitchen-grade steel scourer and placed these into the catch can.

i don't see any problems myself with the "over the cams" type of catch can other than there's not too much room above the engine and its just another thing to remove when changing spark plugs

hope that helps

Warren

djr81 Grand Master

djr81

Posted
Posted

For my 10 cents worth.

There are two issues with RB26's.

Firstly the usual one with what we could loosely call 'fumes'.

Secondly a more problematic one with the volume of oil retained in the head of the motor at high rpm.

Now the first of these is not a big problem. Just about any catch can worth its salt will fix this problem & help stop oil build up in the I/C.

The second is more problematic. RB26's have a well known issue which, put simply, means that there is alot (too much) oil retained in the head of the motor when it runs at high rpm for a longish period of time. What can and does happen is when cornering this oil floods your newly installed catch can & you end up with a massive mess that takes ages to clean up. The style of catch can infont of the breathers can help prevent this from happening.

Just something to think about.

noone Experienced

noone

Posted
  • Author
Posted (edited)

djr81 am aware of the oil control issues.

"The style of catch can infont of the breathers can help prevent this from happening"

not quite sure if I follw u there, do u mean coz its plumbed as 100% plumb back or can it still get plumbed to atmosphere? (hard to tell in pic)

U mean the ovr the rocker cover type yeah.

WazR32GTSt yeh can see how that would be a benefit in cleaning etc. to be able to open it, figured I could still stuff in the home brew baffels (steel wool etc) if i had to (does anyone know if this type is usually baffeled) and can just remove from car to clean if that is ever needed.

Edited by noone
djr81 Grand Master

djr81

Posted
Posted
djr81 am aware of the oil control issues.

"The style of catch can infont of the breathers can help prevent this from happening"

not quite sure if I follw u there, do u mean coz its plumbed as 100% plumb back or can it still get plumbed to atmosphere? (hard to tell in pic)

U mean the ovr the rocker cover type yeah.

Becuase there is another path that the oil has to wind its way around before it arrives at the catch can. And, yeah I mean the rocker cover type.

noone Experienced

noone

Posted
  • Author
Posted (edited)
Becuase there is another path that the oil has to wind its way around before it arrives at the catch can. And, yeah I mean the rocker cover type.

Thought that path was the over the rocker cover catch can? Maybe I am getting it a bit wrong.

Would still like to know if u can plumb that type open to atmosphere so no oil in intercooler etc.

And if they are baffeled or not?

Edited by noone
CameronBNR32 Proficient

CameronBNR32

Posted
Posted

Hey, I was in the exact same position you are in now a couple of weeks ago, couldn't find any catch cans that was to my tastes for the RB26..... so I made my own. :(

to me the one that sits on top of the cam covers doesnt do sh#t, has no internal baffles, and is just hollow.. so wtf does it do?!?.

the cusco one is abit better,if you fill it with something to slow down/catch the oil vapour, but with a GTR's engine bay, there is no room for it.

this is what I made: Just a simple alloy box that sits infront of the battery, with a inlet tube, filled with stainless steel scourers and a hole on the other side, bought a plug to block off the recirculation valve in the head, plugged up the pipe running to the inlet side and ran a length of tube running from the ventalation pipe to the catch can....

some pics of what I made:

Oil Catch Can Pic 1

Oil Catch Can Pic 2

Tube Running From Cam Cover

All up probably cost me around $60-70 for all materials...

hope this helps :laugh:

Cameron

djr81 Grand Master

djr81

Posted
Posted

to me the one that sits on top of the cam covers doesnt do sh#t, has no internal baffles, and is just hollow.. so wtf does it do?!?.

What it does is stop there being a direct path from the cam cover to your catch can. If you have too much oil in the head & turn left you end up with too much oil in your catch can. So you plumb the lines into the front of the "useless" cylinder & thereby prevent the oil from inundating your can.

MANWHORE Grand Master

MANWHORE

Posted
Posted

The good catch cans are the useful ones, that is, the functional ones. Not really the rice ones.

Sure those chrome cylindrical ones look good, but they're just rice. you can't open them.

the type you want is the one with the allen key top how you can open it. Then you can put baffling in and steel wool so it actually filters something.

noone Experienced

noone

Posted
  • Author
Posted

CameronBNR32 yeh pretty much thinking this is the way to go and about the only spot its really going to fit so yours is the illegal vent to atmosphere type yeah.

Have you had much drama with oil messing up your fairly damn clean lookin engine bay. Was planning to use a small filter or some such meself

CameronBNR32 Proficient

CameronBNR32

Posted
Posted
CameronBNR32 yeh pretty much thinking this is the way to go and about the only spot its really going to fit so yours is the illegal vent to atmosphere type yeah.

Have you had much drama with oil messing up your fairly damn clean lookin engine bay. Was planning to use a small filter or some such meself

Yeah, to be 100% legal I would have to run a pipe back into the valve on the inlet to burn it off.

I havn't had any residue deposites around the catch can, so the scourers do their job well.

I was thinking of getting a little k&n style filter on the end of it also, but didnt bother as no residue/vapour gets to the exit of the can anyway.

CameronBNR32 Proficient

CameronBNR32

Posted
Posted (edited)
pfft you dont need catch cans at all!

This is how you do it :(

post-12828-1172263135.jpg

How neat and tidy is that?

Nice engine bay! :happy: Think I've seen you out at the sprints a couple of times...

does that cause any dramas with head pressurization? I always thought the head needed to 'breathe'

Edited by CameronBNR32

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